The History of Galadriel and Celeborn

[Galin]

In Unfinished Tales, Christopher Tolkien writes:

"It is a natural assumption that Celeborn and Galadriel were present at the ruin of Doriath (it is said in one place that Celeborn "escaped the sack of Doriath"), and perhaps aided the escape of Elwing to the Havens of Sirion with the Silmaril -- but this is nowhere stated."

CJRT, commentary on Celeborn, The History of Galadriel and Celeborn

Can anyone referesh my memory of where this is said, that is, to what text does "in one place" refer, or, if the source has not been published, anyone know if it's "late" at least, say 1968 or later?

Is it somewhere obvious?

I've also revised my idea about the first version of the Elessar tale. I now think Tolkien meant that Olorin (not "Gandalf" the Istar as he would later become) visited Galadriel with the stone, before she could employ Nenya, or in other words, before the Last Alliance and the taking of the One from Sauron.

That at least would explain why Galadriel would consider wielding it.